T&C for crates.io

[pietroalbini]

Currently crates.io does not have any Terms and Conditions document. We need to check with lawyers if this is something we actually need.

[github-actions]

This issue is an item on the Core Team's public agenda, and the team will discuss it every week during the triage meeting. The goal of the issue is to provide a public record of our discussion, so only members of the Core Team are allowed to comment here.

Please get in touch with the Core Team by emailing core-team@rust-lang.org if you have something to add!

[pietroalbini]

No update here this week.

[nikomatsakis]

Update: I e-mailed Mozilla legal to get their opinion.